Milling machine



Apr. 10, 1923.

W. A. STU DY MILLINGMACHINE Filed June 10, 1921 Patented Apia-10, 1923;

WILLIAM A. STUDY, OF RICHMOND, INDIANA.

MILLING MACHINE.

Application filed June 10,

To all whom it may concern:

Be it known that I, WILLIAM A. STUDY, a citizen of the United States, residing in the city of Richmond, in the county of lVayne and State of Indiana, have invented certain new and useful Improvements in Milling Machines, of which the following is a full, clear, and comprehensive specification and exposition, the same being such as will enable others to make and use the same with exactitude.

The object of this invention, broadly speaking, is to make certain improvements in milling machines which are employed in making the offset or step-cut in pistonrings or the like, by which the work performed thereby will be more true and uniform, the work performed with less labor and with less deterioration of tools, with a material increase in production, and providing such improvements at a comparatively low price.

In the manufacture of piston rings it is customary to employ a milling machine having two milling cutters arranged directly one above the other but off-set laterally with relation to each other, but in order that the two outs made into the ring by the two outters shall meet in the diametric center of the ring being operated upon it is necessary that the teeth of the two cutters shall mesh or overlap each other, with the consequent re sult that they sometimes engage each other, which results in damage to the cutters and necessitates that they be ground more frequently than is required when my invention is incorporated.

My invention contemplates the elimination of interference between the cutters, but at the same time assuring that each cut will be made to the proper depth whereby the resultant space in the ring will be fully formed to the medial line of the ring, as shown in the drawings, Fig. 5.

The means for carrying out the principles of my invention in a practical manner is shown in the accompanying drawings, in which- Figure 1 is a side elevation of a milling machine in which my invention is incorporated. Figure 2 is a perspective View of the work supporting block alone. Figure 3 is a front or edge elevation of the milling cutters as they would appear in operation. Figure 4.- is a side elevation of the milling cutters arranged in, accordance with my invention. And Figure 5 shows a portion of a piston 1921. Serial no. 476,425."

In the drawings numeral 1 denotes the pedestal which is adapted to be secured to a floor. Extending upward from one side of the top of the pedestal is the bracket which has a vertical forward face with a vertical dove-tail slot therein. Numeral 3 denotes the bed-plate which is carried by the pedestal and it is located to one side of said bracket and extends at right angles to Said face of the bracket. Slidably mounted on the bed-plate is. the carriage a which is adapted to be moved forward and backwardv by means of the hand-lever 5.

Dove-tailed into the face of the bracket 2 is a movable head 6 which is adapted to be operated by a screw to be turned by the hand-crank 7. Secured in the head (iand extending to the right from the upper portion thereof is the usual chatter-bar and in the lower portion of the head 6 is rotatabl} mounted the upper cutter-shaft 9, the projecting end thereof being mounted in an arm (not shown) which extends down from the chatter-bar 8. Secured on and concentric of the shaft 9 is the milling cutter 10.-

Located parallel with the shaft 9 is the lower cutter-shaft 11 which is identical with the shaft 9 and heretofore has always been placed in absolute vertical alinem'ent there? with. Secured on theshaft .11 is the milling cutter 12. I

At the right the shafts 9 and 11 are connected by means notshown, whereby they will revolve in opposite directionswith relation to each other whereby the pull of both shafts upon the material will be in the same direction.

A pulley 13 is secured on the shaft 11 which is connected by the belt 14 to the pulley 15, the latter being adapted to be driven by the belt 16 from any convenient source of power. I

It is to be observed that the shaft 11 is carried by the bearing head 17 which is sehead 17 being adapted to be located forward or backward by the use of shims or plates 19 located between. it and the face of the bracket 2, substantially as show-n in Fig. 1.

Upon the relative thickness, laterally, of

the heads (3 and 17 depends the vhole printhickness of the piston-ring A to be oper-' ated upon.

With the cutter 10 located directly above the cutter 12 great difficulty is experienced in cutting the medial line of the ring A. without the interference and consequent damage to the cutters, intact it can not be done satisfactorily.

My invention proposes to 'set one of the cutters slightly in advance of the other, thereby permitting the shaft 9 to be slightly lowered, or the shaft 11 to be slightly raised, whereby the horizontal tangential lines at the lower point in the circumference of the cutter 10 and the upper point in the circumference of the cutter 12, will slightly overlap each other but without the possibility of the two cutters coming into actual contact with each other.

ters 10 and 12 are arranged according to myinvention and that they are being driven revo lubly at the proper rate of speed, the

lever 5 being turned forward to move the carriage to its forward limit, with the block 18 away from the cutters.

A ring A to be operated upon may now be laid upon the surface of the block 18 with one portion across the notch 18*. Now if the ring be secured flat upon the block 18 it is evident that if the lever 5 be moved rearward that the block 18, and the ring A, will be carried into contact with the cutters 1.0 and 12, thereby causing the cutters to form the step-cut, as shown in Fig. 5.

From the above it is apparent that 1 accomplish the objects of this invention in a simple, practical, and very eflicient manner.

I desire that it be understood that I am not to be limited to the machine herein shown, or to the details of construction and arrangement set forth, but that various changes may be made therein without departing from the spirit of my invention and without sacrificing any of the advantages thereof.

Having now fully shown and described my invention, What I claim and desire to se cure by Letters Patent of the United States 1s- A milling machine having a bracket with a vertical face, an upper cutter-shaft and a lower cutter-shaft both adjustab'ly connected to said face, means whereby one of said shafts may be adjusted laterally with relation to the other shaft, means for revolving said shafts by power, a bed plate, a can riage adapted to travel horizontally on said bed-plate, a work supporting block having a horizontal upper face with means whereby said block is carried by said carriage, and a milling cutter mounted on each of said shafts whereby each may engage material resting on the surface of said block, all

substantially as shown and described.

In testimony whereof I have hereunto subscribed my name to this specification in the presence of two subscribing witnesses.

WILLIAM A. STUDY. 

